Propane (C3H8) is burned in oxygen to produce carbon dioxide and water. How much heat is given off when 3.0 mol C3H8 are reacted with 5 mol O2?
1. 672 kJ
2. 1555 kJ
3. 2012 kJ
4. 4435 kJ
5. 6048 kJ
6. 7392 kJ
7. 916 kJ
8. 5122 kJ

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates